How to Keep Algae From Growing in an Air Conditioner Condensation Line

Inspect the air conditioner regularly for any signs of mold or algae buildup. Look for green or brown growth starting to appear on the system because it will spread rapidly unless it is removed. Clean the affected areas with an algaecide to prevent the algae from spreading into the condensation line. The blower motor fan blade is one place where algae may start growing first.

Wipe down the system with a damp rag any time it starts to look dusty or dirty. Removing debris helps reduce the risk of system clogs that contribute to algae growth.

Empty the condensate drain pan daily if the AC is used frequently. If the pan gets full, the overflow into the condensation line can lead to algae and mold over time.

Place algae strips into the condensate pan -- algae strips are strips of zinc or copper that help prevent algae from growing.

Change the air conditioner's filters every 30 days. Check your manual to determine how to do this properly with your specific model. The filter is useful in preventing algae from building up and if it clogs from age or overuse, the condensation line may be compromised.

Run the system for 10 minutes every two weeks even in colder weather to get the parts moving and to encourage airflow. Algae often grow in a stagnant environment, and this helps prevent algae clogs from forming in the line. Do not do this in freezing weather, when the system could be damaged by expanding ice.